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Special Series: Cancer Immunoprevention: a New Author Manuscript Published OnlineFirst on September 18, 2014; DOI: 10.1158/1940-6207.CAPR-14-0213 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. Special Series: Cancer Immunoprevention: A New Approach to Intercept Cancer Early Asad Umar Author Affiliation: Gastrointestinal & Other Cancers Research Group, Division of Cancer Prevention, National Cancer Institute, Bethesda, Maryland. Corresponding Author: Asad Umar, DVM, PhD, Chief, Gastrointestinal & Other Cancers Research Group, Division of Cancer Prevention, National Cancer Institute, 9609 Medical Center Drive, 5E226, Bethesda, MD 20892-9782. Phone: (240) 276-7070; Fax:(240) 276-7848; Email: [email protected] Downloaded from cancerpreventionresearch.aacrjournals.org on September 29, 2021. © 2014 American Association for Cancer Research. Author Manuscript Published OnlineFirst on September 18, 2014; DOI: 10.1158/1940-6207.CAPR-14-0213 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. Cancer Immunoprevention Cancer immunoprevention refers to the modulation of the host immune response to control the initiation or development of cancer. The significant role of host immunity in early tumorigenesis has only recently been confirmed, as a better understanding of the mechanisms, molecules and cells involved in tumor immunology has been elucidated over the past two decades. Of utmost importance, preclinical and clinical evidence have demonstrated that early neoplastic cells (transformed cells that initiate cancer formation) express antigens that allow the immune system to distinguish them from normal cells. Furthermore, recognition of the aberrant cell by the immune cells activates a complex interaction of mutual modulation between the immune cells, the tumor and the tumor microenvironment that may result not only in inhibition but also promotion of cancer. The deepening understanding of cancer-related immunological processes, properties and components has spawned exploration of more rational, mechanism-based immunological strategies (using vaccines, antibodies and immune modulators) for cancer prevention. This introduction to the Cancer Prevention Research immunoprevention series will attempt to review the basics of the immune response modulation as a basis for potential application to cancer immunoprevention strategies with an emphasis on vaccines. Recognizing the fast-paced research in immune response modulation, the series will cover current understandings and future directions of cancer immunoprevention research (1-3). Mechanistic Bases of Immunoprevention: A Primer Innate Versus Adaptive Immunity The concept of cancer immunomodulation is based on the physiologic immune response during the natural course of disease. The immune response has been historically divided into two types: innate and adaptive (4, 5). The innate immune response provides immediate, short-term protection against a variety of nonspecific antigens. In contrast, adaptive immune responses develop Downloaded from cancerpreventionresearch.aacrjournals.org on September 29, 2021. © 2014 American Association for Cancer Research. Author Manuscript Published OnlineFirst on September 18, 2014; DOI: 10.1158/1940-6207.CAPR-14-0213 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. over a longer period of time, are specific, and provide long-term protection. Activation of innate and subsequent adaptive immunity is fundamental to effective immunological eradication of exogenous and endogenous pathogens and undesirable endogenous cells (e.g., cancer cells). The essential components of each type of immunity differ, but their activities overlap. The elements of the innate immune system are 1) epithelial barriers, 2) phagocytic leukocytes, 3) dendritic cells, 4) natural killer (NK) cells, and 5) circulating plasma proteins. Elements of the adaptive immune system fall into two functional categories: humoral immunity, mediated by the antibodies produced by B lymphocytes, and cellular immunity, mediated by T lymphocytes (6). Dendritic cells (DCs) are one of the major sentinels of both innate and adaptive immune responses. During the innate response, dendritic cells scan for potential pathogens using Toll-like receptors (TLR), which are pattern recognition receptors. Once the TLR recognizes and then processes, it activates nuclear factor kappa B cells (NF-B) and mitogen-activated protein kinase (MAPK) signal transduction pathways, which play a large role in initiation and regulation of innate immune responses (7-9). Modulation of TLR immune responses are being pursued as potential therapeutic targets for various inflammatory diseases and cancer. The adaptive or acquired (specific) immune response is much more complex than the innate (non-specific) response as it continually adapts to new pathogenic signals (i.e., infections or tumor antigens). Upon encountering an antigen presented on dendritic cells or other antigen presenting cells, this plastic system undergoes somatic hypermutations in the B cell receptors leading to high affinity immune responses, producing antibodies with increased highly-specific antigen bonding capacity and durability (5, 10). With each repeated antigen encounter, more of the same antibodies are produced. This process conveys the long-term memory of the adaptive immune system, which can be elicited by both tumor-specific antigens and oncogenic infectious agents. Thus, both B and T memory cells can respond quickly to subsequent challenges by the same antigen. Conversely, in later stages of carcinogenesis and chronic inflammation, Downloaded from cancerpreventionresearch.aacrjournals.org on September 29, 2021. © 2014 American Association for Cancer Research. Author Manuscript Published OnlineFirst on September 18, 2014; DOI: 10.1158/1940-6207.CAPR-14-0213 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. regulatory T cells (Tregs) and myeloid-derived suppressor cells (MDSCs) are invoked, which subdue the immune response (11; see Table 1). Cancer Immunosurveillance and Immunoediting More recently, the immune response to cancer has been termed “immunoediting,” which expands upon “immunosurveillance,” a hypothesis that was introduced by Burnet and Thomas in the mid twentieth century (12-14). However, much later in the century, with the availability of novel molecular techniques, the hypothesis was pursued (Figure 1). The immunoediting hypothesis proposes that both the innate and adaptive immune systems provide an immunosurveillance function, which inherently identifies and eliminates aberrant cells and builds a durable specific defense against them. This hypothesis also explains how tumors are able to escape from the anti-tumor immune responses (15). For instance, sarcomas from immunodeficient mice were significantly more immunogenic than tumors from wild-type mice that arose in the presence of an intact immune system (16), indicating that immune response is sculpting the tumors’ ability to be recognized by the immune system. Recently, the presence, location and density of T cells and cytokines within colorectal tumors was shown to have a better prognosis hence emphasizing that immune response’s ability to maintain a subclinical tumor in an equilibrium state (17). However, in the setting of late stages of cancer, these mechanisms are often co-opted to favor the tumor, where they collectively carry out “immunoediting,” manipulating their microenvironment by expression of inhibitory chemokines and cytokines as well as recruitment of immunosuppressive cells such as MDSCs and Tregs (2, 3). Immunology of Vaccines Against Oncogenic Infectious Agents Both innate and adaptive immune responses play important roles in the battle against oncogenic infectious agents. Two major types of helper T (Th) cells may be induced by antigen presenting cells: Th1 (characterized by interferon- Downloaded from cancerpreventionresearch.aacrjournals.org on September 29, 2021. © 2014 American Association for Cancer Research. Author Manuscript Published OnlineFirst on September 18, 2014; DOI: 10.1158/1940-6207.CAPR-14-0213 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. gamma secreting) for intracellular pathogens and Th2 (characterized by release of interleukin (IL) 4 and B cell activation) for extracellular pathogens. T cells can only recognize antigens in the context of the major histocompatibility complex (MHC). In addition to Th cells, cytotoxic T-lymphocytes (CTL or Killer cells, CD8+) play a key role in clearing infections. Immunology of Vaccines Against Tumor-Associated Antigen Of the approaches designed to harness an individual’s immune system against cancer, vaccine’s use are the best known; they have shown greater success in cancer prevention than treatment. The preferential success of preventive vaccination is attributable in large part to a minimal or non-existent tumor burden. In addition, candidates for preventive vaccination still have fully competent immune systems capable of developing robust anti-tumor responses leading to eradication of abnormal cells and/or preventing disease onset and recurrence. The endogenous immune response may prevent cancer via three basic approaches by 1) using vaccines to prevent infection with cancer- associated agents; 2) using vaccines to target tumor-associated antigens (TAAs) or tumor-specific antigens; and 3) using non-specific
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